Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d9b6facab752190…

MALICIOUS

PDF

60.8 KB Created: 2020-03-10 07:02:42 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 7eb66adc6ca04a2beb621a900c7ccbe7 SHA-1: 3312738094a0fc330fabbb0320fef4466f0c65ae SHA-256: 0d9b6facab752190553b8ac8fa3cc7b6b1e1d4fd8184d8b021bb2b2d5a33100f
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, identified as a link farm, suggesting a malicious intent to manipulate search engine results or redirect users to potentially harmful content. The ML classifier strongly supports the malicious verdict. No scripts were extracted, and the document body was heavily obfuscated, preventing a deeper analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://mail.aliamphoto.com/uploads/1/3/0/7/130775748/130775748.html#gcse+maths+foundation+revision+worksheets+pdf
    • http://getcleanoc.com/uploads/1/3/0/5/130546244/6265115.pdf
    • http://aacostarrica.org/uploads/1/3/0/2/130272442/koxek.pdf
    • http://mercigifts.ca/uploads/1/3/0/6/130639027/rujizekupab.pdf
    • http://81444.brdge.org/uploads/1/3/0/6/130621328/sodupoziberu.pdf
    • http://mjeportfolios.com/uploads/1/3/0/6/130604026/7976661.pdf
    • http://riciclometalli.it/uploads/1/3/0/7/130740242/melagopafikebovoxuv.pdf
    • http://tressesaunaturale.com/uploads/1/3/0/7/130738798/4597934.pdf
    • http://amarelobyrute.co.uk/uploads/1/3/0/7/130776055/809c7.pdf
    • http://autodiscover.jhigh18.com/uploads/1/3/0/4/130483809/4532942.pdf
    • http://eatstayfly.com/uploads/1/3/0/7/130776132/befexegubanowetifop.pdf
    • http://it-scc.com/uploads/1/3/0/6/130621190/nukodugonok.pdf
    • http://monetki.website/uploads/1/3/0/4/130483370/bebitezuponiromu.pdf
    • http://studioalphabrescia.com/uploads/1/3/0/2/130289585/lofafonekabase_wolamamozifex.pdf
    • http://lalollascatering.com/uploads/1/3/0/9/130968956/fipox.pdf
    • http://mifitnesslife.com.au/uploads/1/3/0/4/130488416/rapasefajimokiviwaki.pdf
    • http://citizentrack.com/uploads/1/3/0/6/130620646/figatamobuvowe.pdf
    • https://mathsapp.pixl.org.uk/PMA.swf
    • https://www.kerboodl
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ad99.bin
ccaf4bf107f1d19683eddf760d4e36dd69d01936d8f7b39c20467d6cd3a2d59b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD99 8524 bytes
font_01_sfnt_off0000ce6e.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE6E 16036 bytes

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